Prepayment meter mechanism



June 11, 1935. c. GRASEBY ,5

PREPAYMENT METER MECHANISM Filed Jan. 4, 1954 2 Sheets-Sheet 1 June 11, 1935. R. .c. GRASEBY PREPAYMENT METER MECHANISM Filed Jan. 4, 1934 2 Sheets-Sheet 2 Patented June 11, 1935 UNTED STATES PA TEN OFFICE PREPAYMENT -METER MECHANISM Robert Constantine Graseby, New ll/Ialden, 7 England Application January 4, 1934, Serial No.'705,293

In Great Britain January 12, 1933' 7 Claims.

This invention relates to prepayment meter mechanism having means whereby a standing charge, such as may be payable in respect of the installation with which the meter is used, for

5 example, a rent for the meter, may be collected. Prepayment meter mechanism according to the present invention is of the kind (hereinafter referred to as the kind specified) which comprises (a) controlling means for a supply, (2)) 10 prepayment mechanism to operate the controlling means and including a portion that is coinoperated to set another portion of the prepayment mechanism, and connections between the prepayment mechanism and the motor of the meter whereby the said motor controls or drives said other portion of the prepayment mechanism in its return towards a zero position where it causes the controlling means to cut ofi the supply, and other motor mechanism, for example a spring-driven or electrically-driven motor mechanism (hereinafter referred to for convenience of description as a time motor), which also drives or permits to be driven said other portion of the prepayment mechanism to return it towards its zero position. Such other motor mechanism (time motor) constitutes the means whereby the standing charge is collected.

The invention has for its object to provide means whereby the standing charge may be at any rate selected within limits controlled by the construction of the mechanism, which is accurately adjustable and which will provide for ready ascertainment of the particular standing charge selected.

The prepayment mechanism to which the means referred to may be applied is particularly, though not exclusively, applicable for controlling the supply of electrical energy.

The invention will now be described by way of example, with reference to the accompanying partly diagrammatic drawings wherein:

Fig. 1 shows 'a perspective view of mechanism for use with prepayment meter mechanism to enable a standing charge to be collected at any rate selected within the limits controlled by the construction; parts are broken away, parts of the gearing omitted and the top plate is separated from the remainder of the mechanism for the sake of clearness,

Fig. 2 shows a partly perspective view partly in section of the meter casing with the mechanism illustrated in Fig. I mounted in the top thereof,

Fig. 3 shows a detail of the clutch 3,

Fig. 4 shows a partly diagrammatic view of a 55. prepayment meter for electrical energy embody ing the mechanism illustrated in Fig. 1, and Figure 5 shows a'front elevation of change-gearing forming part'of the mechanism of Figure 2. Reference ;will first be made to Figs. 1 to 3. The time motor of the prepayment meter 5 mechanism will usually be-a constantspeed electric motor indicated at I6. The rotor of this time motor is connected through atrain of gears I, I, I, I, to a spindle Z-carryinga crank comprising adisc 3 having'a-stud 4 extending from its face. The stud 4 is-connected by a connecting rod 5 (shown in the drawings broken away) to a stud 6 carried on a gear member I which meshes with agear member 8- A pair of freewheel clutches is constituted by a drum member 9 having cylindrical recesses in opposite faces and spider members ID in said recesses, for example, of the known form shown in Fig. 3 in which in one direction-of rotation balls II are gripped between the surface of each'member I0 and the'inner surface of the recess in the member 9. This member Q-carries a gear wheel I2 which is connected through a gear train I3, I4, I5, to the'gear wheel IT. The gear member 8 is fixed to the lower spider member I0 (Fig. 1) of the pair of clutches. The other spider member of the'pair of clutcheshas an outwardly projecting arm I8 which extends between a pair of stop pins I9, 20.- The pair of clutches is so arranged that the drum member 9 will free-wheel in the same angular direction in relation to spider members II], the two clutches being viewed from the same direction. One stop pin 20 is carried on a fixed plate 2| of the mechanism and the other stop pin I9 is carried on a disc 22 fixed to a spindle 23 which forms a bearing for the spindle (not shown) of the upper spider member. Said spindle has fixed to it a worm wheel 24 which is engaged by a worm 25 on a spindle 25 which may be turned with a key 34 (see Fig. 2). The spindle 23 projects through a plate 21 bearing a money rate scale 28 and carries a pointer 29 which moves over said scale. By rotating the spindle 26 the position of the stop;p"1n IS in relation to the stop pin 20 may be adjusted and the amount of the adjustment can be seen by the position of the pointer on the money rate scale. I n

In order to permit the range to be alteredwithin which the mechanism will charge provision is made for changing the sizes of certain of the gear wheels employed in the. mechanism. For this purpose the gear wheel I3 is connected to the first of thegear wheels I5 by gear wheels I4 which, in the example 66 collect a fixed shown, are mounted on a common spindle. Said gear wheels 14 are carried on a removable plate 36 (see Figs. 2 and 5) secured to the mechanism by screws 31. A second set of gear wheels 14' of difierent size is also carried on the plate and is arranged in such a position that the plate 30 may be turned over to cause said other set of gear wheels [4 to be included in the gear train insteadof, the gear wheels Hi. 'It will be noted that the plate referred to as 30 consists of two plates which are separated and the gear wheels l4 and M are mounted between said two plates. pg I It will be understood that other plates carry ing gear wheels of difierentsizesmay be ar ranged to be substituted when it is desired to collect a fixed charge within a still, diflerent. range. f i The end of the worm spindle 26 is opposite to a hole 32 in the casing 33 inwhich the meter mechanism ispmounted soas to permit the application of-the key 34.. The-hole 32 isfcovered by a, hinged door 35 which isflocked by the coin box 36. when the latter placed in position. The operation of the mechar iismis follows: The time motor driv es the crank disc 3, con tinuously in one direction; and by means of the crank t and connecting 'rodfi continuous rocking motion is imparted to the lower. spider memi ber of-thepairof clutches. Themembers 9 IU- of both clutches are in such, close engagement that thereis isufiicient grip to ..cause them to, move. together unless one part isheld. When the lower spider member of the clutches is rocked in one directionfor the: first part of its movement it carries with it in free-wheel position but held by friction) the drum member 9 of the clutches and also the upper. spider member until the arm l8 thereon engages one;

of the pair oi stop pins l;8, Z-ll,. When this haps s d upp spid member is, d. and;

clutches and holdsthe member fiand the lower spider member; continues its motion-by free-wheeling; in relation to. the said member 9. W n. t m tion. o he lowerspid r. memb r is ed. so a h i ..rqek.ed. in the o e e on it. r p h m mber 9 and. m ve h a te nd w t he. upper spide m m of the clutchesreversely.: Thisgeverse moveme t co t n e ntil. he. arm. to -said u pe sp e m m e neeses th other teps m n. t h d. an th low rp de me be e. t ther wi h the me b r locked. to i ontinues. to move nt l he motion. oi, t e dri ng ranls causes. the. l w r-spid r member to move-a a n.

n the fi st d rect on. fieete hi mov nt s t t th d um membe .9. of the clut h s. moves a. ce tain dist nce on direction. which. c led by the distan apart of h two t ppins M1 a d. move in. the, rev rs .di-ree t on; a d tan Whi h s-the wh dista ce of. movement in said direction ofithel ower spider: m mb r... T e. d fierence etween, the two amounts of movement is transferred through the,- c a nc l-Z;5.l3. to driv a. p r the p epayment, m chanism; (or: act to permit a spr n to ri idpart ottheprepayment; me hanism) in the same direction asthe mot-or; mech-. nism he meter .drivesiorrermits o' riven. d; part o the. prepayme t. mechani m o re rn t o a ze Q-positiom o c us t n.

t oll n means. t c t oft the supp y.

ts, Z-llfbyrotatingthe disc some amount of m t o tt hsmitt d: y searing; m y" be Br iust ng; h d s n epat o the step.

ployed in any meter in which a time motor is employed to drive or permit to be driven the other portion of the prepayment mechanism of a. meter tov return said mechanism towards its zero position. The mechanism described above is inserted between such time motor and said other portion of the prepaymentmechanism.

The stop pins l9, 2!) may be carried on the upper spider member of the pair of clutches and the arm H} be mounted on a. fixed part of the mechanism. The position of both stop pins may be adjustable. I

Reference will now be made to Fig. 4 which shows a partly diagrammatic View of a prepayment meter for electrical energy embodying the mechanism illustrated in Fig. 1. The prepayment mechanism includes a. star wheel 31 which rotated by the engagement of, anarm or pro-. jection. 38 on the coin" drum 39- when a coin is inserted in said drum and the latter is rotated. The star wheel. 3'! is; fixed to one sun wheel 40. of a fi-rst differential, the other sun wheel 4! being-cohhected-through gearing 42, 43, 44, to one sun wheel 45; of a second differential. The. planet wheel 46. of the first differential is con,- nected to the other portion of the prepayment mechanism. Said other portion of the mech-- trolling means tacut. oft the supply.- The sec- 0nd sun; wheel 50, oi the second difierential is. eonnectedthrough a gear wheel 5| to. the gear wheel I! of the mechanism illustrated in Fig. L, Saidmechanism is. enclosed inthe box marked A. L6 is a constant speed electric motor which is conneotcd to-thegfirst gear wheel I of said mechanism. The planet wheel 52 of the second d-ifferentialis mounted on a spindle 53 to rotate; bodily with it and is also mounted to rotate axially in-the usual manner on a part extending from said spindle. A gear wheel 54 is fixed on" said spindle; and is connected through a gear wheel 55 to a gearwheel 56 which isv free on the spindle carrying the sun wheel M of the firstdifierentiall' The gear wheel 56 is connectedthrough gearing 51 to a flier comprising a.

v The various gear wheels and parts are 7 mounted between the plates .21, 21 and 38 in the usual manner.

The mechanism described above may be em SOi the pins or arms 59 is spaced from the spindle 58 at a distance such that the pins or arms en'- gage the barrel 60 and the driving means is held up hereby until said barrel 60 rotates to such a position that a pin or arm can pass over a flat or through a groove and thus release the driving means. The barrel 60 is driven through gearing indicated at 62 by the meter motorindicated at 63.

The switch mechanism which comprises the controlling means for the supply will now be briefly referred to.

This mechanism is more fully disclosedin the specification of my Patent No. 1,962,391.

A first lever pivoted at 64 carries pivotally at 65 at the end of one arm a floating lever whose one arm- 66 carries a retaining pin 61 normally disposed within the rim 4'! and which will move through the gap 48 therein. The other arm 68 of the floating lever carries an upstanding pin 69 which engages a first spring switch arm car-. rying a first contact. The. floating lever also has an extension which carries an additional pin 10 which engages with the spring controlled retaining catch H. A second spring switch arm 12 carries a contact 13. The first spring switch arm is behind the arm 72 shown in the drawing and is so disposed that the two contacts cooperate and are the contacts of the switch or controlling means for the supply of electrical energy. The switch arm 12 is engaged by a. pin 14 on one arm of a further lever 15 whose other arm carries a pin 16 which lies in the path of the retaining catch H.

The operation of the mechanism illustrated in Fig. 4 is as follows:A coin having been inserted in the drum 39, the latter is rotated whereby the arm 38 causes the star wheel 31 to be rotated and the spring 49 to be wound up. The rim 41 is at the same timemoved to a position such that the retaining pin 61 is held within it and the first lever is moved to close the switch contacts. This is effected as follows:The drum 39 carries a pin 1! which when the drum is rotated engages the arm 18 of the first lever. The retaining pin 61 on the floating lever bears on the inside of the rim 4! and thus the floating lever moves with the first lever about the pin 61 against a spring. The upstanding pin 69 moves the first spring switch arm, which is disposed behind the arm 12, towards said second spring switch arm 12. During this movement the additional pin 10 on the floating lever moves the retaining catch 1| against its spring and thus causes the lever 15 to move and the pin '14 on it to move the second switch arm 12 in the same direction as the first switch arm. This continues until the pin 10 on the floating lever moves past the end of the catch II when the latter is released and returns to the original position under the action of its spring. The lever 15 is then free and the second switch arm 12 moves quickly towards the first switch arm to close the switch and the retaining catch holds it closed.

Assume the time motor l6 to be stationary and the meter motor 63 operating. Said motor drives the barrel 60 through the gearing 62 thereby releasing the arms 59 and allowing the spindle 58 to rotate. Consequently the gear wheel 56 1'0- tates and through the gear wheels 55 and 54 the planet wheel 52 moves round bodily and thus the sun wheel 45 rotates. The sun wheel 4| rotates with the sun wheel 45 and the planet wheel 46 thus also rotates bodily, the drive being effected by the spring 49. The rim 4'! is thus returned towards a zero position at which'the controlling means cuts ofi the supply when the quantity has been supplied for which payment has been made.

Assume now the time motor l6 to be operating and the meter motor 63 to be stationary. In these circumstances the gear wheel I! is permitted to rotate. Thus the sun wheel 50 of the second differential rotates and causes an axial rotation of the planet wheel 52 so that the sun wheel 45 rotates and from it the sun wheel 4| of the first'differential, whereby the planet wheel 46 rotates bodily and with it the rim 41, the arrangement being such that the constant speed motor l6 permits the spring 49 to drive the rim 41. This drive operates even when the motor mechanism of the meter is not operating and until the rim 4'! has travelled the distance it would have travelled if the consumption had continued until the energy prepaid had been used. On the insertion of another coin in the meter the mechanism may be resetand a further supply obtained. As has been described with reference to Fig. 1 the amount of rotation of the gear wheel I! will depend upon how the mechanism indicated at A has been set.

In practice the time motor l6 and themeter motor 63 to, permit the spring 49 to drive the other portion 47 0f the prepayment mechanism towards the zero position.

It will be understood that the meter motor 53 and the time motor [6 may be interchanged.

When the rim 4'! is returned to its zero position the pin 61 can move out throughthe gap 48. The switch then opens under the action of the springiness of the switch arms or of another spring embodied in the mechanism.

What I claim is:-

1. For a prepayment meter mechanism having means for collecting a fixed charge including a time motor, and a supply-control means, means for connecting the time motor with the supply-control means comprising a pair of freewheel clutches whose members are similarly disposed (when viewed from one and the same direction) and are in such frictional engagement that they move together, even in the freewheeling direction, unless one member is held, mechanism for operatively connecting the time motor with one member of one of the clutches and adapted for imparting thereto a rocking movement with a constant stroke, stop means for restricting the stroke of rocking movement of the corresponding member of the other clutch, means for adjusting said stop means, and means for connecting the other members of the clutches together and to the supply-control means, the latter thereby receiving the restricted stroke in the one direction and the full constant stroke in the other direction. I

2. For a prepayment meter mechanism having means for collecting a fixed charge including a time motor, and a supply-control means, means for connecting the time motor with the supplycontrol means comprising a pair of free-wheel clutches whose members are similarly disposed (when viewed from one and the same direction) and are in such frictional engagement that they move together, even in the free-wheeling direction, unless one member is held, mechanism for operatively connecting the time motor with one member of one of the clutches and adapted for imparting thereto a rocking movement with a constant stroke, stop means are usually operating simultaneously for restricting the stroke of the corresponding member of the other clutch and consisting of a, pair of pins and an arm' extending. between them, the said pins and the said. arm being carried one by the saidzcorresponding member of the other clutch and the: other from aifixed part of the meter mechanism means to vary the distance apart of the pins, and means for connecting thewother members of the clutches together and to the supply-control means, the latter thereby receiving the restricted stroke in the one direction, and- 'the'full constant-stroke in the other direction;

3'. Apparatus according-to claim 2,w wherein one pin is permanently fixed in position and the other adjustable towards and away from it. 4:. For a prepayment 'meter having a time motor and asupply-contrcl means, means for operatively connecting the said motor and-supply-control means comprising twofree-wheel clutches whereof the members are similarly disposed (viewed from the same direction) and are in 'such frictional engagement. that they move together also in the free-wheeling direction unless one' member is heldjrocking. mechanism operatively connected with-one member of one of the clutches and adapted for being connected with the time motor, an arm connected to the corresponding member-of the other clutch; a. fixed stop-pin on one .side of saidarm, a support mounted co-axially with the clutches, a". stop-spin onthe, other side of said arm and" carried byhsaid support, gearing forradjusting the said support, and means for connecting. the other membersiof the clutches together and to the control means.

5.. Apparatus according to. claim 4, comprising also an indicator operatively connected with the gearing for adjusting the support and stop-pin carried. thereby. ,v

6. For a, prepayment meter having a time motor and a supply-controlmeans, means for connecting the motor andisu'pply-control means comprisinglclutch .means, I rocking mechanism connected to saidclutch means and adapted for being driven by the time motor, an operative gear-connection between said clutch means and the supply-control means including interchangeable sets of different gear-"Wheels, and a carrierlfor the saidLsets of'gear-Wheels which may bechanged in position to bring one or the other set of gear-wheels into engagement.

7. Apparatus according to claim 6 wherein the inter-changeable sets ofdifierent gearwheels arejournalled in a detachable plate and means is providedfor mounting the plate in either of two relatively inverted ;-p'ositions to bring one or the other" set of gear-Wheels into engagement.

.-ROBERT CONSTANTINE GRASEBY; 

